%0 Journal Article %A Solomon, R. C. %T Families of sets and functions %J Czechoslovak Mathematical Journal %D 1977 %P 556-559 %V 27 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1977.101493/ %R 10.21136/CMJ.1977.101493 %G en %F 10_21136_CMJ_1977_101493